package com.sky.aspect;

import com.sky.annotation.AutoFile;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义注解，实现公共字段自动填充类型
 */
@Aspect
@Component
@Slf4j
public class AutoFileAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFile)")
    public void autoFilePointcut() {}

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFilePointcut()")
    public void AutoFile(JoinPoint joinPoint) {
        log.info("开始进行公共字段的填充...");

        //获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFile autoFile = signature.getMethod().getAnnotation(AutoFile.class);
        OperationType operationType = autoFile.value();
        //获取当前被拦截的方法的参数---实体对象
        Object[] args = joinPoint.getArgs();
        if(args.length == 0 || args == null) {
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT) {
            //为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity, localDateTime);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, localDateTime);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        else if(operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                //通过反射为对象属性赋值

                setUpdateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, localDateTime);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }





    }


}

